Published 2006

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Publication details

Journal : American Statistician , vol. 60 , p. 335–339 , 2006

International Standard Numbers :
Printed : 0003-1305
Electronic : 1537-2731

Publication type : Academic article

Contributors : Langsrud, Øyvind

Issue : 4

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Kjetil Aune
Chief Librarian


This article describes a new plot that aids understanding the relationship between two response variables in a designed experiment. In addition to plotting the observed values directly, we make a scatter plot of orthogonal contrasts from the general linear model. This plot contains the same correlation information as the ordinary scatter plot. Therefore, one can interpret how the effects of the various design variables contribute to the correlation coefficient. This idea is also useful in more general cases. Any graphic presentation of the original observations can be accompanied by a corresponding plot of orthogonal contrasts that often will clarify the interpretation.